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831.
These studies were designed to test cognitive dissonance theory's assertion that alternatives are not reevaluated before a choice. Participants viewed information about horses in a simulated race and rated each one's chance of winning three times before placing their bet and once after placing it. It was found that ratings of the chosen horse increased within the predecision period as well as after betting. Predecision bolstering occurred even when participants did not expect to bet, and predecision preference increased with task importance and participant expertise. The findings are attributed to maintenance of consistency throughout a cognitive system. 相似文献
832.
Recent analyses of serial correlations in cognitive tasks have provided preliminary evidence of the presence of a particular
form of long-range serial dependence known as 1/fnoise. It has been argued that long-range dependence has been largely ignored in mainstream cognitive psychology even though it
accounts for a substantial proportion of variability in behavior (see, e.g., Gilden, 1997, 2001). In this article, we discuss
the defining characteristics of long-range dependence and argue that claims about its presence need to be evaluated by testing
against the alternative hypothesis of short-range dependence. For the data from three experiments, we accomplish such tests
with autoregressive fractionally integrated moving-average time series modeling. We find that long-range serial dependence
in these experiments can be explained by any of several mechanisms, including mixtures of a small number of short-range processes. 相似文献
833.
Previous work has demonstrated that drugs increasing brain concentrations of acetylcholine can enhance cognition in aging and brain-damaged organisms. The present study assessed whether galantamine (GAL), an allosteric modulator of nicotinic cholinergic receptors and weak acetylcholinesterase inhibitor, could improve acquisition and retention of an eyeblink (EB) classical conditioning task in healthy, young animals. We trained 24 rabbits (n = 8/group) in a 1000-msec trace Pavlovian EB conditioning paradigm in which a tone conditioned stimulus (CS) was presented for 500 msec, followed by a 500-msec trace period in which no stimuli were presented. A 100-msec corneal airpuff was the unconditioned stimulus (US). Acquisition sessions, consisting of 100 trials each, occurred daily for 10 consecutive days, followed by 3 d of extinction training. Animals were treated with one of three doses of GAL (0.0-3.0 mg/kg) prior to each session. Animals that received 3.0 mg/kg GAL showed significantly more EB conditioned responses (CRs) in fewer training trials than animals receiving either 1.5 mg/kg GAL or vehicle injections. GAL had no effect on CR performance during extinction. Pseudoconditioning control experiments, consisting of 200 explicitly unpaired tone-puff presentations indicated that GAL did not increase reactivity to the CS or US. These findings indicate that GAL may improve acquisition of moderately difficult associative learning tasks in healthy young organisms. 相似文献
834.
Three experiments examined people's ability to incorporate base rate information when judging posterior probabilities. Specifically, we tested the (Cosmides, L., & Tooby, J. (1996). Are humans good intuitive statisticians after all? Rethinking some conclusions from the literature on judgement under uncertainty. Cognition, 58, 1-73) conclusion that people's reasoning appears to follow Bayesian principles when they are presented with information in a frequency format, but not when information is presented as one case probabilities. First, we found that frequency formats were not generally associated with better performance than probability formats unless they were presented in a manner which facilitated construction of a set inclusion mental model. Second, we demonstrated that the use of frequency information may promote biases in the weighting of information. When participants are asked to express their judgements in frequency rather than probability format, they were more likely to produce the base rate as their answer, ignoring diagnostic evidence. 相似文献
835.
836.
Farrell S Lewandowsky S 《Journal of experimental psychology. Learning, memory, and cognition》2003,29(5):838-849
In short-term serial recall, similar sounding items are remembered less well than items that do not sound alike. This phonological similarity effect has been observed with lists composed only of similar items, and also with lists that mix together similar and dissimilar items. An additional consistent finding has been what the authors call dissimilar immunity, the finding that ordered recall of dissimilar items is the same whether these items occur in pure dissimilar or mixed lists. The authors present 3 experiments that disconfirm these previous findings by showing that dissimilar items on mixed lists are recalled better than their counterparts on pure lists if order errors are considered separately from intrusion errors (Experiment 1), or if intrusion errors are experimentally controlled (Experiments 2 and 3). The memory benefit for dissimilar items on mixed lists poses a challenge for current models of short-term serial recall. 相似文献
837.
The visual control of reaching and grasping: binocular disparity and motion parallax 总被引:6,自引:0,他引:6
Watt SJ Bradshaw MF 《Journal of experimental psychology. Human perception and performance》2003,29(2):404-415
The primary visual sources of depth and size information are binocular cues and motion parallax. Here, the authors determine the efficacy of these cues to control prehension by presenting them in isolation from other visual cues. When only binocular cues were available, reaches showed normal scaling of the transport and grasp components with object distance and size. However, when only motion parallax was available, only the transport component scaled reliably. No additional increase in scaling was found when both cues were available simultaneously. Therefore, although equivalent information is available from binocular and motion parallax information, the latter may be of relatively limited use for the control of the grasp. Binocular disparity appears selectively important for the control of the grasp. 相似文献
838.
This experiment examined how (disrespectful vs. respectful) treatment and (negative vs. positive) performance evaluation, both received from the same fellow group members, affects collective identification and willingness to engage in group-serving behavior. It was predicted and found that respectful as opposed to disrespectful intragroup treatment increased collective identification and willingness to engage in group-serving behavior in the immediate group situation, irrespective of whether intragroup evaluation was positive or negative. There was also evidence of a mediating role of collective identification. Regression analyses based on the measurement of perceived intragroup treatment and perceived intragroup evaluation as continuous variables corroborated these findings but also pointed to limits of the positive effects of respectful intragroup treatment. Finally, the interrelation of treatment and evaluation by fellow group members as two possible components of intragroup respect are discussed as well as the political dimension of research on intragroup respect. 相似文献
839.
840.
We investigated thematic processing in sentences containing a prepositional phrase that was ambiguous between a locative and a temporal interpretation. We manipulated context (temporal or locative), target sentence (temporal or locative), and whether or not the main verb of the target and the context was repeated. Results showed that context dictated the participants' thematic expectations. Thematically, congruent target and context pairs were read faster than incongruent pairs. This effect was not modulated by verb repetition. We argue that wh-words cause readers to lodge semantically vacuous thematic roles in their discourse representation that bias a reader's interpretation of subsequent thematically ambiguous adjuncts in their discourse representation. 相似文献